Chapter 19, Problem 9STP

Interpretation Introduction

Interpretation : The general formula for the salt formed in the neutralization reaction is to be identified.

Concept Introduction : Salt and water are created when bases and acids react.

A strong acid and strong base react completely to form a neutral solution. A neutralization reaction is a name for this kind of reaction.

Answer to Problem 9STP

Correct answer: Option (D)

The general formula for the reaction is A ${\text{P}}_{\text{3}}\text{Q}$ .

Explanation of Solution

Reason for correct option:

For each element participating in the reaction, a chemical equation is balanced if it has an equal atom count on the product and reactant sides.

The acid-base reaction takes place between phosphoric acid and sodium hydroxide giving sodium phosphate salt and water.

  ${\text{H}}_3{\text{PO}}_4\left(aq\right)\text{+}3\text{NaOH}\left(aq\right)\to {\text{Na}}_3{\text{PO}}_4\left(s\right)\text{+}3{\text{H}}_{\text{2}}\text{O}\left(l\right)$

The cation is ${\text{Na}}^{+}$ and anion is ${\text{PO}}_4^{3-}$ .

Since the cation is three, it belongs to formula ${\text{P}}_{\text{3}}\text{Q}$ .

So, option (D) is the correct answer.

Conclusion

Reasons for incorrect options:

Options (A), (B), (C): All these options are irrelevant, because according to the product, the cation and anion are taken.